When analyzing the bids for the polished disks used in solar panels, it's crucial to consider currency conversions and potential import taxes to make an informed decision. Thailand Polishing, with a bid of $10,000 USD, is competing against China Polishing, with a bid of ¥70,000 CNY. Given the current exchange rate of $1 USD = ¥6.5 CNY and an import tax of 15%, which bid is more cost-effective after considering these factors?
a) Thailand Polishing
b) China Polishing
c) Both bids are equal
d) Insufficient information to determine